Chinese Phd student and researcher Zhang Dongjing displays a container of sterile adult male mosquitos that are ready to be released in a lab in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease on June 20, 2016 in Guangzhou, China. #

Chinese lab technicians use water to separate male and female larvae in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease on June 21, 2016, in Guangzhou, China. #

Adult female mosquitos are seen under a microscope at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 21, 2016, in Guangzhou, China. #

A Chinese woman holds her grandson next to a mosquito net in their house on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 22, 2016, near Guangzhou, China. #

Chinese lab technicians pour mosquito pupa into containers in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 21, 2016, in Guangzhou, China. #

Chinese Phd student and researcher Zhang Dongjing checks trays of mosquito larvae in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 20, 2016, in Guangzhou, China. #

Chinese residents drive past an Zika virus information poster on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting field trials, on June 21, 2016, near Guangzhou, China. #

A lab technician wears a mask as she places mosquito pupa into a cage in a lab in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 20, 2016, in Guangzhou, China. #

Chinese Phd student and researcher Zhang Dongjing looks at adult mosquitos under a microscope in the lab at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 21, 2016, in Guangzhou, China. #

A local villager walks to her house backdropped by a coal-fired plant on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 23, 2016, in Guangzhou, China. #

A researcher uses a dropper to put mosquito larvae under a microscope at the field lab where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting field trials, on June 21, 2016, near Guangzhou, China. #

Male and female mosquito larvae are separated in the Mass Production Facility in the lab at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 22, 2016, in Guangzhou, China. #

Jun Jie stands behind a mosquito net in his family's house on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 22, 2016, near Guangzhou, China. #

Chinese lab technicians organize containers of adult mosquitos to be released in the Mass Production Facility in the lab at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 22, 2016, in Guangzhou, China. #

A lab technician pours animal blood onto a hot plate to feed to mosquitos in the Mass Production Facility in the lab at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 22, 2016, in Guangzhou, China. #

Local residents gather at the market on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 22, 2016, near Guangzhou, China. #

A lab technician holds plastic containers of sterile adult male mosquitos that are ready to be released in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 20, 2016, in Guangzhou, China. #

Chinese Phd student and researcher Zhang Dongjing checks trays of mosquito larvae in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 20, 2016, in Guangzhou, China. #

A lab technician looks at cages of adult male mosquitos used in research at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 20, 2016, in Guangzhou, China. #

A local villager holds a bag on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 22, 2016, near Guangzhou, China. #

Chinese technicians put pupa into dishes in the lab at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 22, 2016, in Guangzhou, China. #

A Chinese lab technician uses microinjection equipment to inject wolbachia into mosquito eggs at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 21, 2016, in Guangzhou, China. #

A local farmer walks in her fields on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 22, 2016, near Guangzhou, China. #

Chinese technicians separate male and female larvae at the Mass Production Facility in the lab at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 22, 2016, in Guangzhou, China. #

A local fisherman, Chen Shourongon, paddles her boat on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its field release program, on June 23, 2016, in Guangzhou, China. #

A lab technician places mosquito pupa into cages in the Mass Production Facility at the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, on June 20, 2016, in Guangzhou, China. #

Chinese researcher Gan Renxian rides in a cart as he releases adult mosquitos on Shazai Island where the Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease is conducting its release field program, on June 23, 2016, in Guangzhou, China. #